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Edit File: versioning.py

"""Helpers for dealing with software versioning."""

from distutils.version import StrictVersion

def is_version_higher(version1, version2):
    """Check if a version is higher than another.

This takes two software versions in the usual b"x.y" form
    and split them on the decimal character, converting both parts
    to ints, e.g. b"3.2" becomes (3, 2).

It then does a comparison of the two tuples, and returns C{True} if
    C{version1} is greater than or equal to C{version2}.

@param version1: The first version to compare as C{bytes}.
    @param version2: The second version to compare as C{bytes}.
    @return: C{True} if the first version is greater than or equal to
        the second.
    """
    version1 = version1.decode("ascii")
    version2 = version2.decode("ascii")
    return StrictVersion(version1) >= StrictVersion(version2)

def sort_versions(versions):
    """Sort a list of software versions in from the highest to the lowest.

@param version: a C{list} of C{bytes} describing a version.
    """
    strict_versions = sorted(
        [StrictVersion(version.decode("ascii")) for version in versions],
        reverse=True)
    return [str(strict_version).encode("ascii")
            for strict_version in strict_versions]